When an element is burnt in excess oxygen, is the oxide formed always:

1. a crystalline solid
2. greater in mass than the element
3. soluble in water
4. white in color

alright, i know that most oxides are not soluble in water other than group 1 elements and calcium and barium. (correct me if i'm wrong) And not all oxides are white in color. So, what about option 1 and 2? The correct answer is 2, but i don't get it, why must the oxide formed be heavier than the element?? And what kind of oxide isn't a crystalline solid?

The oxide must have a greater mass than the element as O atoms have been added. Thus CuO must have a great mass than Cu.

For 1. I suspect that they are thinking of room temperature and pressure. Thus CO2 is a gas, H2O is a liquid.

Answer this Question

First Name:

School Subject:

Answer:

Related Questions

Chemistry - A compound of the element A and oxygen has a mole ratio of A:O=2:3...
chemistry - An element X burns in air to form an oxide. When the oxide is shaken...
chemistry - 10g of hydrogen is burnt in the presence of excess oxygen.the mass ...
Chemistry - Use the following answers for questions 1 - 3. (A) F (B) S (C) Mg (D...
chemistry - unknown element X combines with oxygen to form the compund XO2. If ...
Gen Chem - Which of the following conditions MUST be true for the entropy of a ...
chemistry plz help!!! - are the following true for the element gallium? if they ...
chemistry - are the following true for the element gallium? if they are false ...
Chemistry - When a 1.350g sample of element X is heated in a stream of chlorine ...
Chemistry - When a 1.350g sample of element X is heated in a stream of chlorine ...